Update help.

Author: wilcobmsft

src/ResourceManager/Subscription/Commands.Subscription/help/AzureRM.Subscription.Preview.md

@@ -1,12 +1,12 @@
 ---
-Module Name: AzureRM.Subscription
+Module Name: AzureRM.Subscription.Preview
 Module Guid: 8074e741-0979-4b4e-8f9b-7243f213d98a
 Download Help Link: 
 Help Version: 1.0.0.0
 Locale: en-US
 ---
 
-# AzureRM.Subscription Module
+# AzureRM.Subscription.Preview Module
 ## Description
 The topics in this section document the Azure PowerShell cmdlets for Azure Subscription in the Azure Resource Manager (ARM) framework. The cmdlets exist in the Microsoft.Azure.Commands.Subscription namespace.